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Java

PhoneRecordStore.java：源码内容
							/*
 * 创建于 2009-12-04
 * 实现手机虚拟电话簿，添加记录，编辑记录，删除记录，查询记录等
 * 
 * 更改注释格式可以:Window - Preferences - Java - Code Style - Code Templates
 */
package net.garrey.util;
import javax.microedition.rms.RecordComparator;
import javax.microedition.rms.RecordFilter;
import javax.microedition.rms.RecordStore;
import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordStoreException;
import net.garrey.model.PhoneItem;
import net.garrey.view.PhoneFind;
import java.util.Vector;
/**
 * 作者： 张三
 * 实现对RecordStore进行操作
 */
public class PhoneRecordStore {
	private static final String RECORDSTORE_NAME="PHONE_DB";
	private static RecordStore phone;
	private  UIController controller;
	
	/*
	 * 含参数的构造方法	
	 */
	public PhoneRecordStore(UIController control){
		controller=control;
	}
	
	//打开RecordStore，没有则创建
    public void openPhone() {
        try {
            phone = RecordStore.openRecordStore(RECORDSTORE_NAME, true);
        }catch (RecordStoreException ex) {            
            phone=null;
        }
    }
    //关闭RecordStore
    public void closePhone() {
        if (phone!= null) {
            try {
                phone.closeRecordStore();
                phone=null;
            } catch (RecordStoreException ex) {}
        }
    }
    //增加记录
    public int addPhone(PhoneItem item) {
                try {
                    this.openPhone();
                    byte[] data=item.getBytes();
                    int id=phone.getNextRecordID();
                	int rec =phone.addRecord(data,0,data.length);
                	this.closePhone();
                	return id;
                } catch (RecordStoreException ex) { }
        
        return -1;
    }
    //更新记录
    public void updatePhone(PhoneItem item){
            try {
                this.openPhone();       
                byte[] data=item.getBytes();
            	phone.setRecord(item.getId(),data,0,data.length);
            	this.closePhone();
            } catch (RecordStoreException ex) { }
    }
    //访问一条记录
    public PhoneItem getPhone(int id){
        PhoneItem item=null;
            try {
                this.openPhone();
            	new PhoneItem(id,phone.getRecord(id));
            	this.closePhone();
            } catch (RecordStoreException ex) { }
            System.out.println("aaaaaaaaaaaaaaaa"+item);
         return item;
    }
    //删除一条记录
    public void deletePhone(int id){
            try {
                this.openPhone();
            	phone.deleteRecord(id);
            	this.closePhone();
            } catch (RecordStoreException ex) {}
    }
    //访问所有记录
    public Vector getPhones(){
        Vector items=new Vector(10,3);
        this.openPhone();//打开RecordStore
        RecordEnumeration enum1=null;
        int ind=0;
        try{
            PhoneItem item=null;
        	enum1=phone.enumerateRecords(null,new InnerComparator(),false);
            while(enum1.hasPreviousElement()){
            	ind=enum1.previousRecordId();
        	    item=new PhoneItem(ind,phone.getRecord(ind));
            	items.addElement(item);
            }
            
        }catch(Exception ex){ex.printStackTrace();}
        finally{
        		try{
        			enum1.destroy();
        		}catch(Exception e){}
        		
        		this.closePhone();//关闭RecordStore
        }//end finally
    
        return items;
    }
    
    //按条件访问记录
    public Vector getContinutePhones(){
        Vector items=new Vector(10,3);
        this.openPhone();//打开RecordStore
        RecordEnumeration enum1=null;
        int ind=0;
        try{
        	System.out.println("我开始搜索了");
            PhoneItem item=null;
        	enum1=phone.enumerateRecords(new InnerFilter(),null,false);
            while(enum1.hasNextElement()){
            	ind=enum1.nextRecordId();
        	    item=new PhoneItem(ind,phone.getRecord(ind));
            	items.addElement(item);
            }
            
        }catch(Exception ex){ex.printStackTrace();}
        finally{
        		try{
        			enum1.destroy();
        		}catch(Exception e){}
        		
        		this.closePhone();//关闭RecordStore
        }//end finally
    
        return items;
    }
    //一个简单的比较器
    private class InnerComparator implements RecordComparator{
        public int compare(byte[] rec1, byte[] rec2){
            if(rec1.length>rec2.length)
                return FOLLOWS;
            else if(rec1.length<rec2.length)
                return PRECEDES;
            else 
                return EQUIVALENT;
        }
    }
    //一个简单的过滤器
    private class InnerFilter implements RecordFilter{
    	public boolean matches(byte[] candidate){
    		System.out.println("我开始搜索了1"+PhoneFind.getKeyValue());
    		String  str = new String(candidate);
    		System.out.println(str.substring(0));
    		if(str.startsWith(PhoneFind.getKeyValue())){
    			System.out.println("好像搜索到！");
    			return true;
    		}
    		System.out.println("好像没有搜索到呀");
    		return false;
    	}
    }
}

						